The Raspberry Pi Foundation has officially announced the long-rumoured Raspberry Pi 4 with 8GB of RAM for $75.
The real barrier to our offering a larger-memory variant was the lack of an 8GB LPDDR4 package.
These are fundamentally identical with the same set of applications and the same desktop environment.
The beta version of the 64-bit Raspberry Pi operating system can be foundhere.
For those who want to look at other 64-bit OS options besides Raspberry, can tryUbuntuandGentoo.
source: www.techworm.net